“ WOW. What an improvement. It is like a different bike. Much smoother and the power is everywhere. It does not matter if you are at 2000RPM or 4000RPM - it pulls like a freight train. ”

2002 XL883R with 1200 Torkster Kit

Marc S

“ WOW! Let me make that perfectly clear, WOW! Totally different machine, I wasn't very satisfied with the Limited before the change, non-responsive, hard time riding under 2000RPM. Now - totally responsive at any RPM! ”

2014 Limited with Zip Kit

David B

“ I just wanted to say ‘You guys rock!’ Zipper’s Performance did some headwork for a buddy of mine and they rip! I’m saving up now so I can purchase the same ones. ”